File openssl-CVE-2015-1790.patch of Package openssl.2020

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File openssl-CVE-2015-1790.patch of Package openssl.2020

commit 59302b600e8d5b77ef144e447bb046fd7ab72686
Author: Emilia Kasper <emilia@openssl.org>
Date:   Tue May 12 19:00:30 2015 +0200

PKCS#7: Fix NULL dereference with missing EncryptedContent.
    
    CVE-2015-1790
    
    Reviewed-by: Rich Salz <rsalz@openssl.org>

Index: openssl-1.0.1i/crypto/pkcs7/pk7_doit.c
===================================================================
--- openssl-1.0.1i.orig/crypto/pkcs7/pk7_doit.c	2015-06-12 12:40:53.809587792 +0200
+++ openssl-1.0.1i/crypto/pkcs7/pk7_doit.c	2015-06-12 12:40:53.838588132 +0200
@@ -468,6 +468,12 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKE
 	switch (i)
 		{
 	case NID_pkcs7_signed:
+        /*
+         * p7->d.sign->contents is a PKCS7 structure consisting of a contentType
+         * field and optional content.
+         * data_body is NULL if that structure has no (=detached) content
+         * or if the contentType is wrong (i.e., not "data").
+         */
 		data_body=PKCS7_get_octet_string(p7->d.sign->contents);
 		if (!PKCS7_is_detached(p7) && data_body == NULL)
 			{
@@ -479,6 +485,7 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKE
 	case NID_pkcs7_signedAndEnveloped:
 		rsk=p7->d.signed_and_enveloped->recipientinfo;
 		md_sk=p7->d.signed_and_enveloped->md_algs;
+        /* data_body is NULL if the optional EncryptedContent is missing. */
 		data_body=p7->d.signed_and_enveloped->enc_data->enc_data;
 		enc_alg=p7->d.signed_and_enveloped->enc_data->algorithm;
 		evp_cipher=EVP_get_cipherbyobj(enc_alg->algorithm);
@@ -504,6 +511,12 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKE
 	        goto err;
 		}
 
+    /* Detached content must be supplied via in_bio instead. */
+    if (data_body == NULL && in_bio == NULL) {
+        PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
+        goto err;
+    }
+
 	/* We will be checking the signature */
 	if (md_sk != NULL)
 		{
@@ -660,8 +673,7 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKE
 		}
 
 #if 1
-	if (PKCS7_is_detached(p7) || (in_bio != NULL))
-		{
+    if (in_bio != NULL) {
 		bio=in_bio;
 		}
 	else

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File openssl-CVE-2015-1790.patch of Package openssl.2020

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